U.S. patent number 4,734,826 [Application Number 07/059,150] was granted by the patent office on 1988-03-29 for work surface with channel for power communication cabling.
This patent grant is currently assigned to Haworth, Inc.. Invention is credited to Allen B. Belka, Harold R. Wilson.
United States Patent |
4,734,826 |
Wilson , et al. |
March 29, 1988 |
Work surface with channel for power communication cabling
Abstract
A work surface structure having a channel arrangement fixed to
and extending longitudinally along a front edge of a top member for
accommodating power/communication cables. The channel arrangement
has a bottom wall provided with openings which accommodate
removable tray modules. One of the tray modules can be of
substantial depth to mount a power unit therein which provides a
plurality of accessible receptacles. Access to the trays is through
the channel, the latter having several openable covers. These
covers are preferably hinged adjacent their rearward edges and, in
the vicinity of their forward edges when in the closed position,
there is defined an elongated access opening which communicates
with the channel to permit power or communication cables to extend
therethrough.
Inventors: |
Wilson; Harold R. (Holland,
MI), Belka; Allen B. (Wayland, MI) |
Assignee: |
Haworth, Inc. (Holland,
MI)
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Family
ID: |
26738407 |
Appl.
No.: |
07/059,150 |
Filed: |
June 5, 1987 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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837909 |
Mar 10, 1986 |
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Current U.S.
Class: |
361/827;
361/729 |
Current CPC
Class: |
A47B
21/06 (20130101); A47B 2021/066 (20130101) |
Current International
Class: |
A47B
21/00 (20060101); H02B 001/20 () |
Field of
Search: |
;312/223 ;361/428 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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0006707Al |
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Jan 1980 |
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EP |
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0010277Al |
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Apr 1980 |
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EP |
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Primary Examiner: Pellinen; A. D.
Assistant Examiner: Ginsburg; Morris
Attorney, Agent or Firm: Flynn, Thiel, Boutell &
Tanis
Parent Case Text
This application is a continuation of U.S. Ser. No. 837,909, filed
Mar. 10, 1986, now abandoned.
Claims
The embodiments of the invention in which an exclusive property or
privilege is claimed are defined as follows:
1. In a work surface structure having a horizontally enlarged top
member with an enlarged and substantially planar upper working
surface, the top member being of substantially rectangular
configuration and including longitudinally extending front and rear
edges, the improvement comprising:
channel means fixedly secured to and extending longitudinally along
said rear edge for defining an elongated channel-like space for
cables or conduits, said channel means including a longitudinally
elongated channel-like member having a bottom wall, and openable
cover means associated with said channel-like member and being
pivotally mounted relative thereto for swinging movement between
open and closed positions, said cover means when in said closed
position extending across and substantially closing off the upper
side of said channel member and being approximately flush with the
upper working surface;
said bottom wall of said channel-like member having first and
second openings extending therethrough, said openings being spaced
apart from one another and individually elongated in the
longitudinal direction of said channel-like member;
first and second removable, longitudinally elongated tray modules
respectively positioned within said first and second openings and
removably supported on the bottom wall of said channel-like member,
said first and second tray modules substantially occupying said
first and second openings and having side flanges which upwardly
overlap said bottom wall adjacent the sides of said openings for
permitting the tray modules to be removably supported on the bottom
wall when occupying said first and second openings.
2. A structure according to claim 1, wherein said first tray module
has a shallow channel-shaped cross section defined by a bottom wall
and a pair of upwardly projecting sidewalls which terminate in said
side flanges which project over and are supportingly engaged on the
bottom wall of the channel-like member, the bottom wall of said
first tray module being substantially parallel with but spaced
downwardly a small distance from the bottom wall of said
channel-like member.
3. A structure according to claim 1, wherein said first tray module
is of a shallow channel-shaped cross section for permitting storage
of cables therein, and wherein said second tray module is of a deep
channel-shaped cross section, said second tray module mounting
therein on a wall thereof an electrical power block which defines
thereon a plurality of conventional receptacles.
4. A structure according to claim 3, wherein said channel-like
member is of shallow depth in that the channel-like member has a
depth which is similar to the depth of the top member, and said
first and second tray modules projecting downwardly beyond the
bottom wall of said channel-like member.
5. A structure according to claim 1, wherein said cover means is
hinged adjacent its forward edge so that the cover means swings
backwardly toward the front edge of said top member when opened,
said cover means when closed having a width less than the width of
the channel-like space to define a continuously open elongated
access opening extending along the free edge of the cover means for
permitting cables to extend therethrough.
6. A structure according to claim 1, wherein said channel-like
member includes a top mounting flange which extends longitudinally
along the upper edge of one sidewall and projects forwardly
outwardly to overlap the working surface of said top member, said
channel means including a lower longitudinally elongated platelike
mounting flange which extends substantially parallel to said top
flange and overlaps a lower surface of said top member adjacent the
rear edge thereof, said lower mounting flange being fixedly secured
longitudinally to said top member and said channel-like member so
that said top member in the vicinity of the rear edge thereof is
rigidly sandwiched between said top and lower flanges.
7. A work surface structure having a horizontally extending
platelike top member with a substantially planar upper working
surface, the top member being of substantially rectangular
configuration and including front and rear edges and a pair of end
edges extending therebetween, comprising:
a power module means secured to said top member adjacent to and
extending longitudinally along said rear edge for providing
electrical power for electrical equipment adapted to be supported
on said top member;
an upwardly-oriented access opening associated with said power
module means, said access opening being adjacent said rear edge and
horizontally elongated generally parallel therewith;
said module means including a housing which is secured to and
projects downwardly from said top member and defines therein a main
compartment which is disposed below and accessible through said
access opening, said housing being horizontally elongated generally
parallel with said rear edge;
a rear flange extending longitudinally along the rear edge of said
access opening and being fixedly related relative to the top
member;
cover means pivotally supported by a hinge for movement relative to
said top member between (1) a closed position wherein it closes off
said access opening and is substantially flush with said upper
working surface and (2) an open position wherein said access
opening is exposed;
said cover means being hinged relative to the top member along a
longitudinally extending front edge of the cover means so that the
cover means swings upwardly and forwardly about the hinge when
being moved into the open position, said cover means when in the
open position overlapping a part of the upper working surface, said
cover means having a longitudinally extending free edge which is
disposed adjacent but spaced slightly forwardly from said rear
flange when said cover means is closed so as to define between said
free edge and said rear flange a narrow longitudinally extending
slot which communicates with said main compartment for permitting
cables to pass therethrough;
said module means including an electrical power unit removably
secured to said housing and having a wall which mounts thereon a
plurality of electrical receptacles, said wall and the electrical
receptacles thereon being accessible solely from said main
compartment, said wall being spaced downwardly from said cover
means and being sloped upwardly as it projects rearwardly so as to
face both upwardly and forwardly for increased accessibilty and
visibility of the receptacles mounted thereon when the cover means
is in its open position; and
said main compartment as defined within said housing defining an
open space in front of said wall and extending downwardly below
said receptacles for storing cables therein.
8. A structure according to claim 7, wherein the housing defines an
elongated channel which extends longitudinally along the rear edge
of said top member throughout the full longitudinal extent thereof,
said channel including a secondary storage compartment therein
which is disposed longitudinally adjacent said main
compartment.
9. A structure according to claim 7, wherein said cover means
includes a plurality of individual covers which are disposed in
side-by-side relationship longitudinally along said access opening,
said covers being individually pivotally movable between open and
closed positions about a common hinge axis.
10. A work surface structure having longitudinally extending front
and rear edges joined together by side edges, said structure
including a top member which defines thereon a substantially planar
upper working surface, comprising:
a power module means secured to said top member and extending
longitudinally along said rear edge for providing electrical power
for electrical equipment adapted to be supported on said top
member;
said power module means including an elongated channel-like housing
which is fixed relative to said top member and extends
longitudinally along and directly adjacent said rear edge, said
channel-like housing opening downwardly from said upper working
surface and defining therein an interior compartment, said
channel-like housing also having in the upper extremity thereof an
upwardly-oriented access opening disposed substantially within the
plane of said upper working surface;
manually movable cover means pivotally supported relative to said
top member for movement between (1) a closed position wherein it
substantially closes off said access opening and is substantially
flush with said upper working surface and (2) an open position
wherein the access opening is exposed, said cover means being
connected by a hinge along its longitudinally extending front edge
relative to said top member so that the cover means is swung
upwardly and forwardly to overlap the upper working surface when
the cover means is moved into its open position, said cover means
when in said closed position being disposed with its free edge
disposed rearwardly from said hinge in close proximity to said rear
edge, the free edge of said cover means when in said closed
position cooperating with said access opening to define a narrow
longitudinally extending slot which is disposed closely adjacent
said rear edge and permits cables to project through said slot into
said compartment;
said module means including an electrical power unit removably
secured to said housing and having a wall which mounts thereon a
plurality of electrical receptacles, said wall and the electrical
receptacles thereon being accessible solely from said compartment,
said wall being spaced downwardly from said cover means, said
compartment including a space therein disposed below said cover
means for permitting storage of cable.
11. A structure according to claim 10, wherein said cover means
includes a plurality of individually swingable cover members
arranged longitudinally along said access opening in side-by-side
relationship.
Description
FIELD OF THE INVENTION
This invention relates to a work surface structure, such as for a
table or for mounting on a wall panel, which work surface structure
has an openable channel associated therewith for power and
communication cabling. The channel having removable modular trays,
with one of the trays having a power block associated
therewith.
BACKGROUND OF THE INVENTION
The modern office environment is using increasing numbers of
electronic equipment which are increasing the demands for both
electrical and communication cabling. These demands, coupled with
the extensive use of open-office systems employing portable
space-divider panels, have greatly complicated the ability to
provide power and communication cabling to desired locations
without creating unsightly clusters of visible cables.
In an attempt to resolve this problem, there has been developed a
work surface having a power block associated therewith, which
surface is suitable for use on a table or wall panel, and is
disclosed in copending application Ser. No. 699 117 filed Feb. 7,
1985, now U.S. Pat. No. 4,654,756, which is Applicants' own prior
development. The disclosure of this latter application is
incorporated herein, in its entirety, by reference.
In an attempt to continue to improve on such arrangements, the
present invention has been developed and this again relates to a
work surface arrangement suitable for mounting on a table or a
wall. The work surface arrangement has a channel structure
extending along the rear edge thereof, which channel is accessible
through a plurality of sidewardly disposed doors. The doors are
preferably hinged adjacent their forward edges to swing forwardly
toward the user to provide access to the channel. The doors, when
closed, define an elongated access opening along the free edges
thereof for permitting cables to extend therethrough into the
interior of the channel, whereby the cables can connect to
equipment located on the work surface.
In an embodiment of the channel structure has a bottom wall
provided with at least two longitudinally spaced openings in the
preferred embodiment, which openings readily mount therein
removable modular trays. These trays each are of a generally
channel-like configuration which enables them to be removably
positioned in the opening due to the trays having flanges which
rest on the bottom wall of the channel arrangement, whereby the
trays can be readily mounted on or removed and interchanged. The
one tray is of a shallow channel-like cross section to provide
extra space for storage of cables. The other tray, in a typical use
environment, is of significant depth and mounts thereon a power
block having several electrical receptacles and/or cabling ports
associated therewith, the power block also typically having surge
protectors, filters and/or overload devices associated therewith.
Electrical power from an external source, such as a receptacle
disposed adjacent the floor, can be fed by a cable which extends
upwardly through the end of the tray for connection to the power
block. Electrical equipment on the work surface can be readily
plugged into the receptacles on the power block by opening the
appropriate doors, with the doors thereafter being closed while
permitting the cables to extend through the access opening which
extends along the free edge of the doors. The modular tray
employing the power block also has a further channel-like tray
fixedly secured to and projecting downwardly therefrom, with this
further channel-like tray being usable for storing excess cable
therein.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view which illustrates two work surface
arrangements according to the present invention disposed in
side-by-side relationship, the work surface arrangements being of
the type which mount on brackets for securement to a vertical wall
panel.
FIG. 2 is a fragmentary side view illustrating the work surface
arrangement mounted on the bracket which secures it to a vertical
wall panel.
FIG. 3 is a partial sectional view as taken substantially along
line III--III in FIG. 1.
FIG. 4 is a perspective view which illustrates the power and
communication channel arrangement in an exploded or separated
condition.
In the following description, certain terms will be used for
convenience in reference only. For example, the words "upwardly",
"downwardly", "rightwardly" and "leftwardly" will refer to
directions in the drawings to which reference is made. The word
"rear" will refer to the edge of the work surface arrangement which
is adjacent the wall panel, namely the rightward side as appearing
in FIGS. 2 and 3. The words "inwardly" and "outwardly" will refer
to directions toward and away from, respectively, the geometric
center of the work surface arrangement and designated parts
thereof. Said terminology will include the words specifically
mentioned, derivatives thereof, and words of similar import.
DETAILED DESCRIPTION
The drawings illustrate a work surface structure 10 according to
the invention. This structure includes a flat sheetlike top member
11 which defines a horizontally enlarged planar upper working
surface. This work surface structure 10 has substantially parallel
rear and front edges 12 and 13 and, in the illustrated embodiment,
the structure 10 is adapted to be supported on brackets or arms 14
which secure to vertical posts associated with a vertical wall
panel in a conventional manner, one example of such structure being
illustrated by U.S. Pat. No. 4,198,913.
In the improved arrangement of the present invention, the work
surface structure 10 has an elongated channel arrangement 16
fixedly secured to and extending longitudinally along the rear edge
12 thereof for accommodating electrical and/or communication
cabling. This channel arrangement 16 includes a shallow upwardly
opening channel member 17 having a bottom wall 18 and a pair of
upwardly projecting sidewalls 21 and 22 so that the channel
arrangement 16 extends longitudinally throughout the complete
length of the work surface structure 10. This channel 17 does not
have a top wall and hence defines a top opening 23 for providing
access into the interior space 24 defined within the channel. This
top opening 23 is at least partially closed by a plurality of doors
or covers 26, the illustrated embodiment having four such covers 26
disposed in side-by-side relationship. Each of these covers 26 is
connected at its frontward edge by a molded plastic hinge 25 to the
channel sidewall 21 adjacent the upper end thereof, whereby the
cover 26 has a hinge which is close to the upper surface 11 so that
the cover 26 can be swung upwardly and forwardly into an open
position wherein it lays back over the surface 11, as appearing in
FIG. 3. This provides access to the channel space 24 through the
full width of the top opening 23. Cover 26, however, can be swung
into a closed position wherein it extends substantially across the
top opening 23 and is substantially coplanar with the top surface
11. When in this closed position, the cover 26, adjacent the free
edge thereof, bears on a pair of fixed stops 27 which engage the
cover adjacent the opposite ends thereof.
When the cover or covers 26 are in the closed position, the covers
have upwardly projecting tabs 28 adjacent the free ends thereof,
and these tabs are spaced forwardly from an opposed flange or wall
29 formed on the rear sidewall of the channel member 17. These
walls 28 and 29 are spaced apart by an access opening 31 which is
relatively narrow, such as 1/2" to 1" in width. This access opening
31 extends the full longitudinal length of the channel arrangement
and provides continuous communication to the space 24 to permit
communication and/or electrical power cables to project outwardly
therethrough for connection to equipment located on the work
surface, even when the covers are closed.
The bottom wall 18 of channel 17 has a pair of openings 33 and 34
extending therethrough, these openings being elongated in the
lengthwise direction of the channel arrangement and spaced apart so
that the bottom wall 18 defines bridge portions 36 which either
separate the openings from one another or from the adjacent end of
the channel. Each of these openings 33 and 34 is adapted to have a
suitable tray module positioned therein depending upon the desired
mode of use.
For example, as illustrated by FIG. 4, the opening 33 supports
therein an elongated tray module 41 which is of a generally
channel-shaped configuration and includes a substantially planar
bottom wall 42 joined to a pair of upwardly projecting sidewalls
43, the latter at their upper ends having outwardly projecting
mounting flanges 44. This modular tray 41 defines an appropriate
storage compartment 46 therein which is rather shallow, and the
opposite ends of the tray are open as indicated at 47.
The tray 41 has a length which substantially corresponds to that of
the opening 33, and the tray is positioned so as to be disposed
within and project downwardly through the opening 33. That is, the
width of the tray as defined between the outside surfaces of the
sidewalls 43 corresponds to the width of the opening 33 so that the
tray can be moved downwardly through the opening 33 so that the
sidewalls 43 in effect define a snug fit with the side edges of the
opening 33. The flanges 44 project outwardly and overlap the bottom
wall 18 of the channel, with this bottom wall preferably being
provided with elongated ribs 48 extending directly along the side
edges of the opening for supporting the flanges 44 thereon, similar
to the rib and flange arrangement as appearing in FIG. 3. With the
modular tray 41 supported within the opening 33, the bottom wall 42
thereof is disposed downwardly a small distance from the channel
bottom wall 18, and this increases the usable space of the channel
arrangement when the covers are closed, thereby providing
additional space for storage of excess cabling and the like.
Depending upon where the cables originate, the cables can pass
outwardly through the open end 47 of the tray to project downwardly
for connection to a communication point disposed near the
floor.
The tray 41 can also be provided with other structure associated
therewith to permit it to be utilized as a storage tray. For
example, either a separate storage compartment can be supported
within the tray, or the bottom wall of the tray itself can be
provided with appropriate dividers extending upwardly therefrom and
across the compartment 46 to function as storage compartments for
different objects.
The tray 41, due to the manner in which it drops into the opening,
can obviously be readily removed and interchanged as desired.
The other opening 34 can also be provided with a removable modular
try 41 as described above.
Alternately, one of the openings, such as the opening 34 in the
illustrated embodiment, can be provided with a tray module 51 which
is designed specifically for accommodating an electrical power
block 55 to permit numerous electrical power receptacles and the
like to be provided substantially at work surface height.
The modular tray 51 is removably fitted within and is suspended
downwardly through the opening 34 in substantially the same manner
as the tray 41 described above. That is, tray 51 has substantially
parallel sidewalls 52 and 53 which define an enlarged compartment
54 therebetween, which sidewalls at their upper ends terminate in
outwardly projecting flanges 56. These sidewalls 52 and 53 are
spaced apart by a distance which substantially corresponds to the
width of opening 34 so that they will be snugly fitted between the
opposite side edges of the opening 34, and the flanges 56 will
project outwardly to overlap and be supported by the ribs or beads
48 which extend along the bottom wall adjacent the edges of the
opening substantially as illustrated by FIG. 3.
As illustrated by FIG. 4, these opposed sidewalls 52 and 53 have a
length which exceeds that of the opening 34 so that the sidewalls
have parts designated 57 which project outwardly beneath the
intermediate bridging portions 36. These parts 57, adjacent the
corners thereof, have openings 58 which accommodate therein the
ends of a spacer pin 59, the latter extending transversely across
the tray 51 so that the reduced ends thereof are accommodated in
the openings 58 to prevent the sidewalls from moving inwardly and
hence effecting dislodgement of the tray from the opening.
The tray 51 has a substantially deep channel-shaped cross section
such that the upwardly cantilevered sidewalls 52 and 53 have
sufficient resilient flexibility to permit them to be deflected
inwardly toward one another. The tray 51 is mounted on the channel
17 by positioning the tray beneath the opening 34. With the
sidewalls 52 and 53 deflected inwardly toward one another, the tray
51 is moved upwardly until the flanges 56 pass through the opening
34, whereupon the sidewalls 52 and 53 are permitted to resiliently
return outwardly away from one another and thereby cause the
flanges 56 to overlap the ribs 48. After being so positioned, the
spacer pins 59 are mounted in the opposed openings 58 to prevent
the sidewalls from being moved inwardly and hence effect undesired
dislodgement of the tray.
As illustrated by FIGS. 3 and 4, the sidewalls 53 and 52 of the
tray have respective lower wall portions 61 and 62 which slope
downwardly and rearwardly to provide the interior channel space 54
with substantial depth. These wall portions 61-62 are appropriately
joined by a bottom wall 63. This provides the channel space 54 with
sufficient space to accommodate therein the power block 52, the
latter being fixedly secured to this bottom wall 63 in the
illustrated embodiment.
The power block 55 is of a conventional configuration and it
includes a plurality for conventional three-hole electrical
receptacles 64 accessible through an exposed sidewall of the
housing thereof, the receptacles being appropriately internally
wired within the housing of the power block through appropriate
filters, surge protectors and overload devices, such being
conventional. Power is supplied to the power block through a
conventional power cord 66 which projects from one end and
terminates in a conventional three-prong plug. This cord 66 can
project outwardly through the open end of the tray 51 below the
channel 17 to be fed downwardly for connection to an appropriate
power receptacle disposed in the vicinity of the floor. Power units
55 are conventional and well known, and further description thereof
is believed unnecessary.
While the illustrated tray module 51 mounts the power block 55 in
the interior thereof, in some instances it may be desirable to
fixedly secure the power unit to the external side of the tray so
that the receptacles are accessible through an opening formed in
the sidewall of the tray. Such an arrangement is illustrated in
aforementioned U.S. Pat. No. 4,654,756, and it is contemplated that
a similar mounting arrangement for the power block could be
provided with respect to the modular tray 51 of this invention.
The modular tray 51 also has a cord or cable-holding tray 67
associated therewith. This latter comprises a channel-like member
which is fixedly secured to and suspends downwardly from the tray
51, with this channel-like member 67 opening forwardly and having a
length similar to that of the tray 51. Channel member 67 has a base
leg 68 joined to top and bottom side legs 71 and 72, respectively.
The top leg 71 is provided with an appropriate flange to permit it
to be removably fixedly secured to the bottom of the tray 51, such
as adjacent the lower edge of the wall 62. The channel member 67
defines therein a storage compartment 73 for excess cabling, this
compartment 73 being accessible through an opening 74 which faces
forwardly and extends throughout the length of the channel member.
The lower leg 72 has a flange 76 projecting upwardly a small extent
along the front edge thereof, thereby partially closing off the
lower portion of storage compartment 73 to facilitate the
confinement of cable therein. This compartment 73 can be readily
accessible for storage of cable therein inasmuch as cable from the
channel 54 of the tray 51 can be fed outwardly through either open
end of the tray 51 and then looped downwardly to be appropriately
coiled and stored within the compartment 73.
The channel arrangement 16 can, in its entirety, be readily fitted
to virtually any type of work surface 11, whether of steel or
particle board, and can also be readily retrofitted to existing
such work surfaces. This is accomplished by the desirable structure
of the channel arrangement 16 and the manner in which it secures to
the edge 15.
For this purpose, the channel member 17 has, adjacent the upper
edge of the front sidewall 21 thereof, a forwardly projecting
mounting flange 81, which flange extends longitudinally throughout
the complete length of the channel member and has a lower surface
which is adapted to snugly overlie the upper surface of the work
surface member 11. This flange 81 is formed integrally with the
channel member 17, the latter preferably comprising a one-piece
extruded member, such as an aluminum extrusion. A further platelike
mounting flange 82 is adapted to be secured to the underside of the
work surface 11 to effectively rigidly sandwich the edge portion of
the work surface member between the flanges 81 and 82. This lower
mounting flange 82 comprises an elongated platelike strip which
extends throughout the complete length of the channel member, with
this strip having one edge thereof disposed to project under and
overlap the bottom wall 18 in the vicinity of the sidewall 21, with
the lower mounting flange 82 being secured to the bottom wall 18 by
a plurality of threaded fasteners or screws 83. In a similar
fashion, a further plurality of threaded fasteners or screws 84
project upwardly through the flange 82 into the work surface 11 to
rigidly and fixedly secure the channel arrangement 16 to the edge
12 of the work surface member 11. With this arrangement, the
channel arrangement can be readily fitted, either in the factory or
at the job site, to a preconstructed work surface member. Further,
in situations where the work surface member is of a particle board
material, a wide work surface member such as a 30" width can be
readily cut down, as by sawing, to a 24" width and then have the
channel arrangement 16 secured thereto. This channel arrangement 16
is preferably about 6" in width, and this will again result in the
creation of a work surface arrangement having an overall width of
substantially 30".
When the work surface arrangement 10 is positioned so as to define
an exposed edge, the end of the channel 17 is appropriately closed
by an end cap 86 which is secured in position by a pair of
screws.
When the tray 51 and power block 55 are utilized, as appearing in
FIG. 3, the storage compartment 54 defined within the interior of
tray 51 provides substantial space for storage of cables and the
like, particularly since this provides accessible space which
projects downwardly around the power block 55 all the way to the
lower or bottom wall 63 thereof. The cables can be stored in the
bottom portion of this space 54 directly adjacent the side of the
power block, and hence not interfere with access to the receptacles
64.
Although a particular preferred embodiment of the invention has
been disclosed in detail for illustrative purposes, it will be
recognized that variations or modifications of the disclosed
apparatus, including the rearrangement of parts, lie within the
scope of the present invention.
* * * * *